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All quests need to be completed. This is the oversight in the plot's integrity that I was talking about. I honestly don't remember everything, as it was a while ago. Most likely, it's just a decoration. Before each "real" castle, there should be a guarded garrison.
What the heck is going on? The demons were supposed to take 150k at the end of the week, but I received a message saying they took everything, even though I had 256k!
Well, I didn't go to them right away, but after a few months.